# Copyright (c) 2012 ARM Limited
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#
# The license below extends only to copyright in the software and shall
# not be construed as granting a license to any other intellectual
# property including but not limited to intellectual property relating
# to a hardware implementation of the functionality of the software
# licensed hereunder.  You may use the software subject to the license
# terms below provided that you ensure that this notice is replicated
# unmodified and in its entirety in all distributions of the software,
# modified or unmodified, in source code or in binary form.
#
# Copyright (c) 2006-2007 The Regents of The University of Michigan
# All rights reserved.
#
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# modification, are permitted provided that the following conditions are
# met: redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer;
# redistributions in binary form must reproduce the above copyright
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# neither the name of the copyright holders nor the names of its
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# this software without specific prior written permission.
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import os
import os.path
import re
import string
import sys
from os.path import join as joinpath

import m5


def skip_test(reason=""):
    """Signal that a test should be skipped and optionally print why.

    Keyword arguments:
      reason -- Reason why the test failed. Output is omitted if empty.
    """

    if reason:
        print(f"Skipping test: {reason}")
    sys.exit(2)


def has_sim_object(name):
    """Test if a SimObject exists in the simulator.

    Arguments:
      name -- Name of SimObject (string)

    Returns: True if the object exists, False otherwise.
    """

    try:
        cls = getattr(m5.objects, name)
        return issubclass(cls, m5.objects.SimObject)
    except AttributeError:
        return False


def require_sim_object(name, fatal=False):
    """Test if a SimObject exists and abort/skip test if not.

    Arguments:
      name -- Name of SimObject (string)

    Keyword arguments:
      fatal -- Set to True to indicate that the test should fail
               instead of being skipped.
    """

    if has_sim_object(name):
        return
    else:
        msg = f"Test requires the '{name}' SimObject."
        if fatal:
            m5.fatal(msg)
        else:
            skip_test(msg)


def require_file(path, fatal=False, mode=os.F_OK):
    """Test if a file exists and abort/skip test if not.

    Arguments:
      path -- File to test for.

    Keyword arguments:
      fatal -- Set to True to indicate that the test should fail
               instead of being skipped.
      modes -- Mode to test for, default to existence. See the
               Python documentation for os.access().
    """

    if os.access(path, mode):
        return
    else:
        msg = f"Test requires '{path}'"
        if not os.path.exists(path):
            msg += " which does not exist."
        else:
            msg += " which has incorrect permissions."

        if fatal:
            m5.fatal(msg)
        else:
            skip_test(msg)


def require_kvm(kvm_dev="/dev/kvm", fatal=False):
    """Test if KVM is available.

    Keyword arguments:
      kvm_dev -- Device to test (normally /dev/kvm)
      fatal -- Set to True to indicate that the test should fail
               instead of being skipped.
    """

    require_sim_object("BaseKvmCPU", fatal=fatal)
    require_file(kvm_dev, fatal=fatal, mode=os.R_OK | os.W_OK)


def run_test(root):
    """Default run_test implementations. Scripts can override it."""

    # instantiate configuration
    m5.instantiate()

    # simulate until program terminates
    exit_event = m5.simulate(maxtick)
    print("Exiting @ tick", m5.curTick(), "because", exit_event.getCause())


# Since we're in batch mode, dont allow tcp socket connections
m5.disableAllListeners()

# single "path" arg encodes everything we need to know about test
(category, mode, name, isa, opsys, config) = sys.argv[1].split("/")[-6:]

# find path to directory containing this file
tests_root = os.path.dirname(__file__)
test_progs = os.environ.get("M5_TEST_PROGS", "/dist/m5/regression/test-progs")
if not os.path.isdir(test_progs):
    test_progs = joinpath(tests_root, "test-progs")


# generate path to binary file
def binpath(app, file=None):
    # executable has same name as app unless specified otherwise
    if not file:
        file = app
    return joinpath(test_progs, app, "bin", isa, opsys, file)


# generate path to input file
def inputpath(app, file=None):
    # input file has same name as app unless specified otherwise
    if not file:
        file = app
    return joinpath(test_progs, app, "input", file)


def srcpath(path):
    """Path to file in gem5's source tree"""
    return joinpath(os.path.dirname(__file__), "..", path)


def run_config(config, argv=None):
    """Execute a configuration script that is external to the test system"""

    src_root = os.path.abspath(os.path.join(os.path.dirname(__file__), "../"))
    abs_path = joinpath(src_root, config)

    code = compile(open(abs_path).read(), abs_path, "exec")
    scope = {"__file__": config, "__name__": "__m5_main__"}

    # Set the working directory in case we are executing from
    # outside gem5's source tree
    os.chdir(src_root)

    # gem5 normally adds the script's directory to the path to make
    # script-relative imports work.
    sys.path = [os.path.dirname(abs_path)] + sys.path

    if argv is None:
        sys.argv = [config]
    else:
        sys.argv = argv
    exec(code, scope)


# build configuration
sys.path.append(joinpath(tests_root, "configs"))
test_filename = config
# for ruby configurations, remove the protocol name from the test filename
if re.search("-ruby", test_filename):
    test_filename = test_filename.split("-ruby")[0] + "-ruby"
exec(
    compile(
        open(joinpath(tests_root, "configs", test_filename + ".py")).read(),
        joinpath(tests_root, "configs", test_filename + ".py"),
        "exec",
    )
)

# set default maxtick... script can override
# -1 means run forever
maxtick = m5.MaxTick

# tweak configuration for specific test
sys.path.append(joinpath(tests_root, category, mode, name))
exec(
    compile(
        open(joinpath(tests_root, category, mode, name, "test.py")).read(),
        joinpath(tests_root, category, mode, name, "test.py"),
        "exec",
    )
)


# Initialize all CPUs in a system
def initCPUs(sys):
    def initCPU(cpu):
        # We might actually have a MemTest object or something similar
        # here that just pretends to be a CPU.
        try:
            cpu.createThreads()
        except:
            pass

    # The CPU attribute doesn't exist in some cases, e.g. the Ruby
    # testers.
    if not hasattr(sys, "cpu"):
        return

    # The CPU can either be a list of CPUs or a single object.
    if isinstance(sys.cpu, list):
        [initCPU(cpu) for cpu in sys.cpu]
    else:
        initCPU(sys.cpu)


# We might be creating a single system or a dual system. Try
# initializing the CPUs in all known system attributes.
for sysattr in ["system", "testsys", "drivesys"]:
    if hasattr(root, sysattr):
        initCPUs(getattr(root, sysattr))

run_test(root)
